Enhanced Safety and Performance of High-Voltage Solid-State Sodium Battery through Trilayer, Multifunctional Electrolyte Design
Enhanced Safety and Performance of High-Voltage Solid-State Sodium Battery through Trilayer, Multifunctional Electrolyte Design
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DOI：
10.1016/j.ensm.2021.05.040
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发表时间：
2021-06-11
影响因子：
20.4
通讯作者：
Kuibbe, Ruth
中科院分区：
文献类型：
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作者：
Ran, Lingbing;Li, Ming;Kuibbe, Ruth
固态电解质有望解决传统液体电池存在的安全隐患和能量密度低的问题。然而，这些电解质的实际应用受到低离子电导率和与高电压阴极存在的不稳定界面的损害。在这里，通过将抗氧化聚丙烯腈（PAN）和抗还原聚（环氧乙烷）（PEO）浸渍到具有致密芯和多孔外层的夹层钠超离子导体（NASICON）框架中，实现了离子导电性、界面和安全性的改善。采用这种三明治复合电解质（SCE），由于多孔网络中的长程连续离子传导途径，在30 ℃下获得了4.13 × 10 ~（-4）S cm ~（-1）的高离子电导率。通过形成致密稳定的界面，大大提高了界面电阻。更重要的是，该SCE的安全性通过原位形成中心致密NASICON层来提高，该NASICON层抑制枝晶生长。此外，将Na 3V 2（PO 4）（2）F-3（NVPF）与该SCE组合的高压固态电池表现出令人印象深刻的倍率性能和长循环寿命。这项研究为设计超安全、高能量密度的固态电池提供了一种有前途的策略。
Solid-state electrolytes are promising to resolve the safety hazards and low energy density of traditional liquid batteries. However, the practical application of these electrolytes has been impaired by the low ionic conductivity and an unstable interface present with a high-voltage cathode. Here, an improvement of ionic conductivity, interface, and safety was achieved by impregnating anti-oxidation polyacrylonitrile (PAN) and anti-reduction poly(ethylene oxide) (PEO) into a sandwich sodium superionic conductor (NASICON) framework with a dense core and porous outer layers. Using this sandwich composite electrolyte (SCE), a high ionic conductivity of 4.13x10(-4) S cm(-1) at 30 degrees C was obtained owing to long-range and continuous ionic conduction pathways in the porous network. The interfacial resistance was greatly improved through the creation of a compact and stable interface. More importantly, the safety of this SCE is improved through the in-situ formation of a central, dense NASICON layer, which suppressed dendrite growth. Furthermore, a high-voltage solid-state battery combining Na3V2(PO4)(2)F-3 (NVPF) with this SCE exhibited an impressive rate performance with long cycle life. This study offers a promising strategy to design ultra-safe, high energy density, solid-state batteries.